1 files changed, 84 insertions, 0 deletions

diff --git a/third_party/rust/heck/src/upper_camel.rs b/third_party/rust/heck/src/upper_camel.rs
new file mode 100644
index 0000000000..70bf4ac70a
--- /dev/null
+++ b/third_party/rust/heck/src/upper_camel.rs
@@ -0,0 +1,84 @@
+use std::fmt;
+
+use crate::{capitalize, transform};
+
+/// This trait defines an upper camel case conversion.
+///
+/// In UpperCamelCase, word boundaries are indicated by capital letters,
+/// including the first word.
+///
+/// ## Example:
+///
+/// ```rust
+/// use heck::ToUpperCamelCase;
+///
+/// let sentence = "We are not in the least afraid of ruins.";
+/// assert_eq!(sentence.to_upper_camel_case(), "WeAreNotInTheLeastAfraidOfRuins");
+/// ```
+pub trait ToUpperCamelCase: ToOwned {
+    /// Convert this type to upper camel case.
+    fn to_upper_camel_case(&self) -> Self::Owned;
+}
+
+impl ToUpperCamelCase for str {
+    fn to_upper_camel_case(&self) -> String {
+        AsUpperCamelCase(self).to_string()
+    }
+}
+
+/// ToPascalCase is an alias for ToUpperCamelCase. See ToUpperCamelCase for more
+/// documentation.
+pub trait ToPascalCase: ToOwned {
+    /// Convert this type to upper camel case.
+    fn to_pascal_case(&self) -> Self::Owned;
+}
+
+impl<T: ?Sized + ToUpperCamelCase> ToPascalCase for T {
+    fn to_pascal_case(&self) -> Self::Owned {
+        self.to_upper_camel_case()
+    }
+}
+
+/// This wrapper performs a upper camel case conversion in [`fmt::Display`].
+///
+/// ## Example:
+///
+/// ```
+/// use heck::AsUpperCamelCase;
+///
+/// let sentence = "We are not in the least afraid of ruins.";
+/// assert_eq!(format!("{}", AsUpperCamelCase(sentence)), "WeAreNotInTheLeastAfraidOfRuins");
+/// ```
+pub struct AsUpperCamelCase<T: AsRef<str>>(pub T);
+
+impl<T: AsRef<str>> fmt::Display for AsUpperCamelCase<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        transform(self.0.as_ref(), capitalize, |_| Ok(()), f)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::ToUpperCamelCase;
+
+    macro_rules! t {
+        ($t:ident : $s1:expr => $s2:expr) => {
+            #[test]
+            fn $t() {
+                assert_eq!($s1.to_upper_camel_case(), $s2)
+            }
+        };
+    }
+
+    t!(test1: "CamelCase" => "CamelCase");
+    t!(test2: "This is Human case." => "ThisIsHumanCase");
+    t!(test3: "MixedUP_CamelCase, with some Spaces" => "MixedUpCamelCaseWithSomeSpaces");
+    t!(test4: "mixed_up_ snake_case, with some _spaces" => "MixedUpSnakeCaseWithSomeSpaces");
+    t!(test5: "kebab-case" => "KebabCase");
+    t!(test6: "SHOUTY_SNAKE_CASE" => "ShoutySnakeCase");
+    t!(test7: "snake_case" => "SnakeCase");
+    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "ThisContainsAllKindsOfWordBoundaries");
+    #[cfg(feature = "unicode")]
+    t!(test9: "XΣXΣ baffle" => "XσxςBaffle");
+    t!(test10: "XMLHttpRequest" => "XmlHttpRequest");
+}